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   <div id="projectname">OpenCV
   &#160;<span id="projectnumber">4.5.2</span>
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   <div id="projectbrief">Open Source Computer Vision</div>
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  <ul>
<li class="navelem"><a class="el" href="../../d9/df8/tutorial_root.html">OpenCV Tutorials</a></li><li class="navelem"><a class="el" href="../../d7/da8/tutorial_table_of_content_imgproc.html">Image Processing (imgproc module)</a></li>  </ul>
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<div class="title">基础图纸</div>  </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><p><b>下一个教程:</b> <a class="el" href="../../df/d61/tutorial_random_generator_and_text.html">Random generator and text with OpenCV</a></p>
<table class="doxtable">
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<th align="right"></th><th align="left"></th></tr>
<tr>
<td align="right">原作者</td><td align="left">Ana Huamán</td></tr>
<tr>
<td align="right">兼容性</td><td align="left">OpenCV &gt;= 3.0</td></tr>
</table>
<h2>Goals(目标)</h2>
<p>在本教程中，您将学习如何:</p>
<ul>
<li>画一条<b>线</b>通过使用OpenCV函数<b><a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2" title="Draws a line segment connecting two points. ">line()</a></b></li>
<li>画一个<b>椭圆</b>通过使用OpenCV函数<b><a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga28b2267d35786f5f890ca167236cbc69" title="Draws a simple or thick elliptic arc or fills an ellipse sector. ">ellipse()</a></b></li>
<li>画一个<b>矩形</b>通过使用OpenCV函数<b><a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9" title="Draws a simple, thick, or filled up-right rectangle. ">rectangle()</a></b></li>
<li>画一个<b>圆圈</b>通过使用OpenCV函数<b><a class="el" href="../../d9/db7/group__datasets__gr.html#gga610754124ced68d1f05760b5948fbb76a6f0d8b2d9e3e947b2a5c1eff9e81ee95">circle()</a></b></li>
<li>画一个<b>填充多边形</b>通过使用OpenCV函数<b><a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga8c69b68fab5f25e2223b6496aa60dad5">fillPoly()</a></b></li>
</ul>
 <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <h2>OpenCV理论</h2>
<p>在本教程中，我们将大量使用两种结构:<a class="el" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">cv::Point</a>和<a class="el" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">cv::Scalar</a>:</p>
<h3>Point</h3>
<p>它表示一个二维点，由其图像坐标 \(x\) 和 \(y\)指定。我们可以将其定义为:</p><div class="fragment"><div class="line"><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> pt;</div><div class="line">pt.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a> = 10;</div><div class="line">pt.y = 8;</div></div><!-- fragment --><p>或</p><div class="fragment"><div class="line"><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> pt =  <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 8);</div></div><!-- fragment --> <h3>标量</h3>
<ul>
<li>表示4元素向量。类型标量在OpenCV中广泛用于传递像素值。</li>
<li>在本教程中，我们将广泛使用它来表示BGR颜色值（3个参数）。如果不使用最后一个参数，则不必定义它。</li>
<li>让我们看一个例子，如果我们被要求一个颜色参数，我们给出:<div class="fragment"><div class="line"><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( a, b, c )</div></div><!-- fragment -->我们将定义BGR颜色，例如:<em>蓝色 = a</em>,<em>绿色 = b</em>和<em>红色 = c</em>  </li></ul></div> 

 <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <h2>OpenCV理论</h2>
<p>在本教程中，我们将大量使用两种结构:<a class="el" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">cv::Point</a>和<a class="el" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">cv::Scalar</a>:</p>
<h3>Point</h3>
<p>它表示一个二维点，由其图像坐标 \(x\) 和 \(y\)指定。我们可以将其定义为:</p><div class="fragment"><div class="line"><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> pt = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>();</div><div class="line">pt.x = 10;</div><div class="line">pt.y = 8;</div></div><!-- fragment --><p>或</p><div class="fragment"><div class="line"><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> pt = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 8);</div></div><!-- fragment --> <h3>标量</h3>
<ul>
<li>表示4元素向量。类型标量在OpenCV中广泛用于传递像素值。</li>
<li>在本教程中，我们将广泛使用它来表示BGR颜色值（3个参数）。如果不使用最后一个参数，则不必定义它。</li>
<li>让我们看一个例子，如果我们被要求一个颜色参数，我们给出:<div class="fragment"><div class="line"><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( a, b, c )</div></div><!-- fragment -->我们将定义BGR颜色，例如:<em>蓝色 = a</em>,<em>绿色 = b</em>和<em>红色 = c</em>  </li></ul></div> 

<h2>Code</h2>
 <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"><ul>
<li>此代码位于OpenCV示例文件夹中。否则你可以从<a href="https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgProc/basic_drawing/Drawing_1.cpp">在这里</a> <div class="fragment"><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d0/d9c/core_2include_2opencv2_2core_8hpp.html">opencv2/core.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#define w 400</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> MyEllipse( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img, <span class="keywordtype">double</span> angle );</div><div class="line"><span class="keywordtype">void</span> MyFilledCircle( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> center );</div><div class="line"><span class="keywordtype">void</span> MyPolygon( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img );</div><div class="line"><span class="keywordtype">void</span> MyLine( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> start, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> end );</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main( <span class="keywordtype">void</span> ){</div><div class="line"></div><div class="line">  <span class="keywordtype">char</span> atom_window[] = <span class="stringliteral">&quot;Drawing 1: Atom&quot;</span>;</div><div class="line">  <span class="keywordtype">char</span> rook_window[] = <span class="stringliteral">&quot;Drawing 2: Rook&quot;</span>;</div><div class="line"></div><div class="line">  <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> atom_image = <a class="code" href="../../d3/d63/classcv_1_1Mat.html#a0b57b6a326c8876d944d188a46e0f556">Mat::zeros</a>( w, w, <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a> );</div><div class="line">  <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> rook_image = <a class="code" href="../../d3/d63/classcv_1_1Mat.html#a0b57b6a326c8876d944d188a46e0f556">Mat::zeros</a>( w, w, <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a> );</div><div class="line"></div><div class="line"></div><div class="line">  MyEllipse( atom_image, 90 );</div><div class="line">  MyEllipse( atom_image, 0 );</div><div class="line">  MyEllipse( atom_image, 45 );</div><div class="line">  MyEllipse( atom_image, -45 );</div><div class="line"></div><div class="line">  MyFilledCircle( atom_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, w/2) );</div><div class="line"></div><div class="line"></div><div class="line">  MyPolygon( rook_image );</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>( rook_image,</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 7*w/8 ),</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w, w),</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 255, 255 ),</div><div class="line">         <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a89c5f6beef080e6df347167f85e07b9e">FILLED</a>,</div><div class="line">         <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a> );</div><div class="line"></div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 15*w/16 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w, 15*w/16 ) );</div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/4, 7*w/8 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/4, w ) );</div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, 7*w/8 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, w ) );</div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*w/4, 7*w/8 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*w/4, w ) );</div><div class="line"></div><div class="line">  <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( atom_window, atom_image );</div><div class="line">  <a class="code" href="../../d7/dfc/group__highgui.html#ga8d86b207f7211250dbe6e28f76307ffb">moveWindow</a>( atom_window, 0, 200 );</div><div class="line">  <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( rook_window, rook_image );</div><div class="line">  <a class="code" href="../../d7/dfc/group__highgui.html#ga8d86b207f7211250dbe6e28f76307ffb">moveWindow</a>( rook_window, w, 200 );</div><div class="line"></div><div class="line">  <a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>( 0 );</div><div class="line">  <span class="keywordflow">return</span>(0);</div><div class="line">}</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">void</span> MyEllipse( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img, <span class="keywordtype">double</span> angle )</div><div class="line">{</div><div class="line">  <span class="keywordtype">int</span> thickness = 2;</div><div class="line">  <span class="keywordtype">int</span> lineType = 8;</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga28b2267d35786f5f890ca167236cbc69">ellipse</a>( img,</div><div class="line">       <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, w/2 ),</div><div class="line">       <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>( w/4, w/16 ),</div><div class="line">       angle,</div><div class="line">       0,</div><div class="line">       360,</div><div class="line">       <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 0, 0 ),</div><div class="line">       thickness,</div><div class="line">       lineType );</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> MyFilledCircle( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> center )</div><div class="line">{</div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#gaf10604b069374903dbd0f0488cb43670">circle</a>( img,</div><div class="line">      center,</div><div class="line">      w/32,</div><div class="line">      <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 255 ),</div><div class="line">      <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a89c5f6beef080e6df347167f85e07b9e">FILLED</a>,</div><div class="line">      <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a> );</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> MyPolygon( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img )</div><div class="line">{</div><div class="line">  <span class="keywordtype">int</span> lineType = <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a>;</div><div class="line"></div><div class="line">  <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> rook_points[1][20];</div><div class="line">  rook_points[0][0]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,   7*w/8 );</div><div class="line">  rook_points[0][1]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,   7*w/8 );</div><div class="line">  rook_points[0][2]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,  13*w/16 );</div><div class="line">  rook_points[0][3]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 11*w/16, 13*w/16 );</div><div class="line">  rook_points[0][4]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 19*w/32,  3*w/8 );</div><div class="line">  rook_points[0][5]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,   3*w/8 );</div><div class="line">  rook_points[0][6]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,     w/8 );</div><div class="line">  rook_points[0][7]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*w/40,    w/8 );</div><div class="line">  rook_points[0][8]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*w/40,    w/4 );</div><div class="line">  rook_points[0][9]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*w/40,    w/4 );</div><div class="line">  rook_points[0][10] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*w/40,    w/8 );</div><div class="line">  rook_points[0][11] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*w/40,    w/8 );</div><div class="line">  rook_points[0][12] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*w/40,    w/4 );</div><div class="line">  rook_points[0][13] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*w/40,    w/4 );</div><div class="line">  rook_points[0][14] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*w/40,    w/8 );</div><div class="line">  rook_points[0][15] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,     w/8 );</div><div class="line">  rook_points[0][16] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,   3*w/8 );</div><div class="line">  rook_points[0][17] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 13*w/32,  3*w/8 );</div><div class="line">  rook_points[0][18] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  5*w/16, 13*w/16 );</div><div class="line">  rook_points[0][19] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,  13*w/16 );</div><div class="line"></div><div class="line">  <span class="keyword">const</span> <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a>* ppt[1] = { rook_points[0] };</div><div class="line">  <span class="keywordtype">int</span> npt[] = { 20 };</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga8c69b68fab5f25e2223b6496aa60dad5">fillPoly</a>( img,</div><div class="line">        ppt,</div><div class="line">        npt,</div><div class="line">        1,</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 255, 255 ),</div><div class="line">        lineType );</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> MyLine( <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> start, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> end )</div><div class="line">{</div><div class="line">  <span class="keywordtype">int</span> thickness = 2;</div><div class="line">  <span class="keywordtype">int</span> lineType = <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a>;</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">line</a>( img,</div><div class="line">    start,</div><div class="line">    end,</div><div class="line">    <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 0 ),</div><div class="line">    thickness,</div><div class="line">    lineType );</div><div class="line">}</div></div><!-- fragment -->  </li></ul></div> 

 <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"><ul>
<li>此代码位于OpenCV示例文件夹中。否则你可以从<a href="https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgProc/BasicGeometricDrawing/BasicGeometricDrawing.java">在这里</a> <div class="fragment"><div class="line"><span class="keyword">import</span> org.opencv.core.*;</div><div class="line"><span class="keyword">import</span> org.opencv.core.Point;</div><div class="line"><span class="keyword">import</span> org.opencv.highgui.HighGui;</div><div class="line"><span class="keyword">import</span> org.opencv.imgproc.Imgproc;</div><div class="line"></div><div class="line"><span class="keyword">import</span> java.util.*;</div><div class="line"><span class="keyword">import</span> java.util.List;</div><div class="line"></div><div class="line"><span class="keyword">class </span>GeometricDrawingRun{</div><div class="line"></div><div class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keywordtype">int</span> W = 400;</div><div class="line"></div><div class="line">    <span class="keyword">public</span> <span class="keywordtype">void</span> run(){</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga1f6634802eeadfd7245bc75cf3e216c2">String</a> atom_window = <span class="stringliteral">&quot;Drawing 1: Atom&quot;</span>;</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga1f6634802eeadfd7245bc75cf3e216c2">String</a> rook_window = <span class="stringliteral">&quot;Drawing 2: Rook&quot;</span>;</div><div class="line"></div><div class="line">        Mat atom_image = Mat.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#a0b57b6a326c8876d944d188a46e0f556">zeros</a>( W, W, CvType.CV_8UC3 );</div><div class="line">        Mat rook_image = Mat.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#a0b57b6a326c8876d944d188a46e0f556">zeros</a>( W, W, CvType.CV_8UC3 );</div><div class="line"></div><div class="line">        MyEllipse( atom_image, 90.0 );</div><div class="line">        MyEllipse( atom_image, 0.0 );</div><div class="line">        MyEllipse( atom_image, 45.0 );</div><div class="line">        MyEllipse( atom_image, -45.0 );</div><div class="line"></div><div class="line">        MyFilledCircle( atom_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, W/2) );</div><div class="line"></div><div class="line">        MyPolygon( rook_image );</div><div class="line"></div><div class="line">        Imgproc.rectangle( rook_image,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 7*W/8 ),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W, W),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 255, 255 ),</div><div class="line">                -1,</div><div class="line">                8,</div><div class="line">                0 );</div><div class="line"></div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 15*W/16 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W, 15*W/16 ) );</div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/4, 7*W/8 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/4, W ) );</div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, 7*W/8 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, W ) );</div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*W/4, 7*W/8 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*W/4, W ) );</div><div class="line"></div><div class="line">        HighGui.imshow( atom_window, atom_image );</div><div class="line">        HighGui.moveWindow( atom_window, 0, 200 );</div><div class="line">        HighGui.imshow( rook_window, rook_image );</div><div class="line">        HighGui.moveWindow( rook_window, W, 200 );</div><div class="line"></div><div class="line">        HighGui.waitKey( 0 );</div><div class="line">        System.exit(0);</div><div class="line">    }</div><div class="line"></div><div class="line"></div><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyEllipse( Mat img, <span class="keywordtype">double</span> angle ) {</div><div class="line">        <span class="keywordtype">int</span> thickness = 2;</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        Imgproc.ellipse( img,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, W/2 ),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>( W/4, W/16 ),</div><div class="line">                angle,</div><div class="line">                0.0,</div><div class="line">                360.0,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 0, 0 ),</div><div class="line">                thickness,</div><div class="line">                lineType,</div><div class="line">                shift );</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyFilledCircle( Mat img, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> center ) {</div><div class="line">        <span class="keywordtype">int</span> thickness = -1;</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        Imgproc.circle( img,</div><div class="line">                center,</div><div class="line">                W/32,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 255 ),</div><div class="line">                thickness,</div><div class="line">                lineType,</div><div class="line">                shift );</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyPolygon( Mat img ) {</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>[] rook_points = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>[20];</div><div class="line">        rook_points[0]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, 7*W/8   );</div><div class="line">        rook_points[1]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, 7*W/8   );</div><div class="line">        rook_points[2]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, 13*W/16 );</div><div class="line">        rook_points[3]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 11*W/16, 13*W/16 );</div><div class="line">        rook_points[4]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 19*W/32, 3*W/8   );</div><div class="line">        rook_points[5]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, 3*W/8   );</div><div class="line">        rook_points[6]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, W/8     );</div><div class="line">        rook_points[7]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*W/40, W/8     );</div><div class="line">        rook_points[8]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*W/40, W/4     );</div><div class="line">        rook_points[9]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*W/40, W/4     );</div><div class="line">        rook_points[10] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*W/40, W/8     );</div><div class="line">        rook_points[11] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*W/40, W/8     );</div><div class="line">        rook_points[12] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*W/40, W/4     );</div><div class="line">        rook_points[13] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*W/40, W/4     );</div><div class="line">        rook_points[14] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*W/40, W/8     );</div><div class="line">        rook_points[15] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, W/8     );</div><div class="line">        rook_points[16] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, 3*W/8   );</div><div class="line">        rook_points[17] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 13*W/32, 3*W/8   );</div><div class="line">        rook_points[18] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  5*W/16, 13*W/16 );</div><div class="line">        rook_points[19] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, 13*W/16 );</div><div class="line"></div><div class="line">        MatOfPoint matPt = <span class="keyword">new</span> MatOfPoint();</div><div class="line">        matPt.fromArray(rook_points);</div><div class="line"></div><div class="line">        List&lt;MatOfPoint&gt; ppt = <span class="keyword">new</span> ArrayList&lt;MatOfPoint&gt;();</div><div class="line">        ppt.add(matPt);</div><div class="line"></div><div class="line">        Imgproc.fillPoly(img,</div><div class="line">                ppt,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 255, 255 ),</div><div class="line">                lineType,</div><div class="line">                shift,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(0,0) );</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyLine( Mat img, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> start, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> end ) {</div><div class="line">        <span class="keywordtype">int</span> thickness = 2;</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        Imgproc.line( img,</div><div class="line">                start,</div><div class="line">                end,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 0 ),</div><div class="line">                thickness,</div><div class="line">                lineType,</div><div class="line">                shift );</div><div class="line">    }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="keyword">class </span>BasicGeometricDrawing {</div><div class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">void</span> main(<a class="code" href="../../dc/d84/group__core__basic.html#ga1f6634802eeadfd7245bc75cf3e216c2">String</a>[] args) {</div><div class="line">        <span class="comment">// Load the native library.</span></div><div class="line">        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);</div><div class="line">        <span class="keyword">new</span> GeometricDrawingRun().run();</div><div class="line">    }</div><div class="line">}</div></div><!-- fragment -->  </li></ul></div> 

 <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"><ul>
<li>此代码位于OpenCV示例文件夹中。否则你可以从<a href="https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/imgProc/BasicGeometricDrawing/basic_geometric_drawing.py">在这里</a> <div class="fragment"><div class="line"><span class="keyword">import</span> cv2 <span class="keyword">as</span> cv</div><div class="line"><span class="keyword">import</span> numpy <span class="keyword">as</span> np</div><div class="line"></div><div class="line">W = 400</div><div class="line"></div><div class="line"><span class="keyword">def </span>my_ellipse(img, angle):</div><div class="line">    thickness = 2</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga57be400d8eff22fb946ae90c8e7441f9">cv.ellipse</a>(img,</div><div class="line">                (W // 2, W // 2),</div><div class="line">                (W // 4, W // 16),</div><div class="line">                angle,</div><div class="line">                0,</div><div class="line">                360,</div><div class="line">                (255, 0, 0),</div><div class="line">                thickness,</div><div class="line">                line_type)</div><div class="line"></div><div class="line"><span class="keyword">def </span>my_filled_circle(img, center):</div><div class="line">    thickness = -1</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#gaf10604b069374903dbd0f0488cb43670">cv.circle</a>(img,</div><div class="line">               center,</div><div class="line">               W // 32,</div><div class="line">               (0, 0, 255),</div><div class="line">               thickness,</div><div class="line">               line_type)</div><div class="line"></div><div class="line"><span class="keyword">def </span>my_polygon(img):</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <span class="comment"># Create some points</span></div><div class="line">    ppt = np.array([[W / 4, 7 * W / 8], [3 * W / 4, 7 * W / 8],</div><div class="line">                    [3 * W / 4, 13 * W / 16], [11 * W / 16, 13 * W / 16],</div><div class="line">                    [19 * W / 32, 3 * W / 8], [3 * W / 4, 3 * W / 8],</div><div class="line">                    [3 * W / 4, W / 8], [26 * W / 40, W / 8],</div><div class="line">                    [26 * W / 40, W / 4], [22 * W / 40, W / 4],</div><div class="line">                    [22 * W / 40, W / 8], [18 * W / 40, W / 8],</div><div class="line">                    [18 * W / 40, W / 4], [14 * W / 40, W / 4],</div><div class="line">                    [14 * W / 40, W / 8], [W / 4, W / 8],</div><div class="line">                    [W / 4, 3 * W / 8], [13 * W / 32, 3 * W / 8],</div><div class="line">                    [5 * W / 16, 13 * W / 16], [W / 4, 13 * W / 16]], np.int32)</div><div class="line">    ppt = ppt.reshape((-1, 1, 2))</div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga311160e71d37e3b795324d097cb3a7dc">cv.fillPoly</a>(img, [ppt], (255, 255, 255), line_type)</div><div class="line">    <span class="comment"># Only drawind the lines would be:</span></div><div class="line">    <span class="comment"># cv.polylines(img, [ppt], True, (255, 0, 255), line_type)</span></div><div class="line"></div><div class="line"><span class="keyword">def </span>my_line(img, start, end):</div><div class="line">    thickness = 2</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">cv.line</a>(img,</div><div class="line">             start,</div><div class="line">             end,</div><div class="line">             (0, 0, 0),</div><div class="line">             thickness,</div><div class="line">             line_type)</div><div class="line"></div><div class="line">atom_window = <span class="stringliteral">&quot;Drawing 1: Atom&quot;</span></div><div class="line">rook_window = <span class="stringliteral">&quot;Drawing 2: Rook&quot;</span></div><div class="line"></div><div class="line"><span class="comment"># Create black empty images</span></div><div class="line">size = W, W, 3</div><div class="line">atom_image = np.zeros(size, dtype=np.uint8)</div><div class="line">rook_image = np.zeros(size, dtype=np.uint8)</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment"># 1.a. Creating ellipses</span></div><div class="line">my_ellipse(atom_image, 90)</div><div class="line">my_ellipse(atom_image, 0)</div><div class="line">my_ellipse(atom_image, 45)</div><div class="line">my_ellipse(atom_image, -45)</div><div class="line"></div><div class="line"><span class="comment"># 1.b. Creating circles</span></div><div class="line">my_filled_circle(atom_image, (W // 2, W // 2))</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment"># 2. Draw a rook</span></div><div class="line"><span class="comment"># ------------------</span></div><div class="line"><span class="comment"># 2.a. Create a convex polygon</span></div><div class="line">my_polygon(rook_image)</div><div class="line"></div><div class="line"><a class="code" href="../../d6/d6e/group__imgproc__draw.html#gac865734d137287c0afb7682ff7b3db23">cv.rectangle</a>(rook_image,</div><div class="line">              (0, 7 * W // 8),</div><div class="line">              (W, W),</div><div class="line">              (0, 255, 255),</div><div class="line">              -1,</div><div class="line">              8)</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">#  2.c. Create a few lines</span></div><div class="line">my_line(rook_image, (0, 15 * W // 16), (W, 15 * W // 16))</div><div class="line">my_line(rook_image, (W // 4, 7 * W // 8), (W // 4, W))</div><div class="line">my_line(rook_image, (W // 2, 7 * W // 8), (W // 2, W))</div><div class="line">my_line(rook_image, (3 * W // 4, 7 * W // 8), (3 * W // 4, W))</div><div class="line"></div><div class="line"><a class="code" href="../../df/d24/group__highgui__opengl.html#gaae7e90aa3415c68dba22a5ff2cefc25d">cv.imshow</a>(atom_window, atom_image)</div><div class="line"><a class="code" href="../../d7/dfc/group__highgui.html#ga8d86b207f7211250dbe6e28f76307ffb">cv.moveWindow</a>(atom_window, 0, 200)</div><div class="line"><a class="code" href="../../df/d24/group__highgui__opengl.html#gaae7e90aa3415c68dba22a5ff2cefc25d">cv.imshow</a>(rook_window, rook_image)</div><div class="line"><a class="code" href="../../d7/dfc/group__highgui.html#ga8d86b207f7211250dbe6e28f76307ffb">cv.moveWindow</a>(rook_window, W, 200)</div><div class="line"></div><div class="line"><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">cv.waitKey</a>(0)</div><div class="line"><a class="code" href="../../d7/dfc/group__highgui.html#ga6b7fc1c1a8960438156912027b38f481">cv.destroyAllWindows</a>()</div></div><!-- fragment -->  </li></ul></div> 

<h2>解释</h2>
<p>因为我们计划绘制两个示例（一个atom和一辆rook），所以我们必须创建两个图像和两个窗口来显示它们。</p> <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line">  <span class="keywordtype">char</span> atom_window[] = <span class="stringliteral">&quot;Drawing 1: Atom&quot;</span>;</div><div class="line">  <span class="keywordtype">char</span> rook_window[] = <span class="stringliteral">&quot;Drawing 2: Rook&quot;</span>;</div><div class="line"></div><div class="line">  Mat atom_image = Mat::zeros( w, w, <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a> );</div><div class="line">  Mat rook_image = Mat::zeros( w, w, <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a> );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga1f6634802eeadfd7245bc75cf3e216c2">String</a> atom_window = <span class="stringliteral">&quot;Drawing 1: Atom&quot;</span>;</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga1f6634802eeadfd7245bc75cf3e216c2">String</a> rook_window = <span class="stringliteral">&quot;Drawing 2: Rook&quot;</span>;</div><div class="line"></div><div class="line">        Mat atom_image = Mat.zeros( W, W, CvType.CV_8UC3 );</div><div class="line">        Mat rook_image = Mat.zeros( W, W, CvType.CV_8UC3 );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"><span class="comment"># Windows names</span></div><div class="line">atom_window = <span class="stringliteral">&quot;Drawing 1: Atom&quot;</span></div><div class="line">rook_window = <span class="stringliteral">&quot;Drawing 2: Rook&quot;</span></div><div class="line"></div><div class="line"><span class="comment"># Create black empty images</span></div><div class="line">size = W, W, 3</div><div class="line">atom_image = np.zeros(size, dtype=np.uint8)</div><div class="line">rook_image = np.zeros(size, dtype=np.uint8)</div></div><!-- fragment --> </div> <p>我们创建函数来绘制不同的几何形状。例如，画我们用的原子<b>MyEllipse</b>和<b>MyFilledCircle</b>:</p> <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line">  MyEllipse( atom_image, 90 );</div><div class="line">  MyEllipse( atom_image, 0 );</div><div class="line">  MyEllipse( atom_image, 45 );</div><div class="line">  MyEllipse( atom_image, -45 );</div><div class="line"></div><div class="line">  MyFilledCircle( atom_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, w/2) );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">        MyEllipse( atom_image, 90.0 );</div><div class="line">        MyEllipse( atom_image, 0.0 );</div><div class="line">        MyEllipse( atom_image, 45.0 );</div><div class="line">        MyEllipse( atom_image, -45.0 );</div><div class="line"></div><div class="line">        MyFilledCircle( atom_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, W/2) );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"><span class="comment"># 1. Draw a simple atom:</span></div><div class="line"><span class="comment"># -----------------------</span></div><div class="line"></div><div class="line"><span class="comment"># 1.a. Creating ellipses</span></div><div class="line">my_ellipse(atom_image, 90)</div><div class="line">my_ellipse(atom_image, 0)</div><div class="line">my_ellipse(atom_image, 45)</div><div class="line">my_ellipse(atom_image, -45)</div><div class="line"></div><div class="line"><span class="comment"># 1.b. Creating circles</span></div><div class="line">my_filled_circle(atom_image, (W // 2, W // 2))</div></div><!-- fragment --> </div> <p>画我们雇的车<b>MyLine</b>,<b>矩形</b>和一个<b>我的多边形</b>:</p> <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line">  MyPolygon( rook_image );</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>( rook_image,</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 7*w/8 ),</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w, w),</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 255, 255 ),</div><div class="line">         <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a89c5f6beef080e6df347167f85e07b9e">FILLED</a>,</div><div class="line">         <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a> );</div><div class="line"></div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 15*w/16 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w, 15*w/16 ) );</div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/4, 7*w/8 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/4, w ) );</div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, 7*w/8 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, w ) );</div><div class="line">  MyLine( rook_image, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*w/4, 7*w/8 ), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*w/4, w ) );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">        MyPolygon( rook_image );</div><div class="line"></div><div class="line">        Imgproc.rectangle( rook_image,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 7*W/8 ),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W, W),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 255, 255 ),</div><div class="line">                -1,</div><div class="line">                8,</div><div class="line">                0 );</div><div class="line"></div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 15*W/16 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W, 15*W/16 ) );</div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/4, 7*W/8 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/4, W ) );</div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, 7*W/8 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, W ) );</div><div class="line">        MyLine( rook_image, <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*W/4, 7*W/8 ), <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 3*W/4, W ) );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"></div><div class="line"><span class="comment"># 2. Draw a rook</span></div><div class="line"><span class="comment"># ------------------</span></div><div class="line"><span class="comment"># 2.a. Create a convex polygon</span></div><div class="line">my_polygon(rook_image)</div><div class="line"></div><div class="line"><a class="code" href="../../d6/d6e/group__imgproc__draw.html#gac865734d137287c0afb7682ff7b3db23">cv.rectangle</a>(rook_image,</div><div class="line">              (0, 7 * W // 8),</div><div class="line">              (W, W),</div><div class="line">              (0, 255, 255),</div><div class="line">              -1,</div><div class="line">              8)</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">#  2.c. Create a few lines</span></div><div class="line">my_line(rook_image, (0, 15 * W // 16), (W, 15 * W // 16))</div><div class="line">my_line(rook_image, (W // 4, 7 * W // 8), (W // 4, W))</div><div class="line">my_line(rook_image, (W // 2, 7 * W // 8), (W // 2, W))</div><div class="line">my_line(rook_image, (3 * W // 4, 7 * W // 8), (3 * W // 4, W))</div></div><!-- fragment --> </div> <p>让我们检查一下这些函数中的每个函数:</p> <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;">  </div> <h4>MyLine</h4>
 <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line"><span class="keywordtype">void</span> MyLine( Mat img, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> start, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> end )</div><div class="line">{</div><div class="line">  <span class="keywordtype">int</span> thickness = 2;</div><div class="line">  <span class="keywordtype">int</span> lineType = <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a>;</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">line</a>( img,</div><div class="line">    start,</div><div class="line">    end,</div><div class="line">    <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 0 ),</div><div class="line">    thickness,</div><div class="line">    lineType );</div><div class="line">}</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyLine( Mat img, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> start, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> end ) {</div><div class="line">        <span class="keywordtype">int</span> thickness = 2;</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        Imgproc.line( img,</div><div class="line">                start,</div><div class="line">                end,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 0 ),</div><div class="line">                thickness,</div><div class="line">                lineType,</div><div class="line">                shift );</div><div class="line">    }</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"><span class="keyword">def </span>my_line(img, start, end):</div><div class="line">    thickness = 2</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">cv.line</a>(img,</div><div class="line">             start,</div><div class="line">             end,</div><div class="line">             (0, 0, 0),</div><div class="line">             thickness,</div><div class="line">             line_type)</div></div><!-- fragment --> </div> <ul>
<li>如我们所见，<b>MyLine</b>只需调用函数<b><a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2" title="Draws a line segment connecting two points. ">line()</a></b>，执行以下操作:<ul>
<li>从点画一条线<b>开始</b>指向<b>结束</b></li>
<li>该行将显示在图像中<b>img</b></li>
<li>线条颜色由<b>( 0, 0, 0 )</b>哪个是对应的RGB值<b>黑色</b></li>
<li>线条粗细设置为<b>厚度</b>（在本例中为2）</li>
<li>这条线是八通的(<b>线型</b>= 8)</li>
</ul>
</li>
</ul>
<h4>MyEllipse</h4>
 <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line"><span class="keywordtype">void</span> MyEllipse( Mat img, <span class="keywordtype">double</span> angle )</div><div class="line">{</div><div class="line">  <span class="keywordtype">int</span> thickness = 2;</div><div class="line">  <span class="keywordtype">int</span> lineType = 8;</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga28b2267d35786f5f890ca167236cbc69">ellipse</a>( img,</div><div class="line">       <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w/2, w/2 ),</div><div class="line">       <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>( w/4, w/16 ),</div><div class="line">       angle,</div><div class="line">       0,</div><div class="line">       360,</div><div class="line">       <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 0, 0 ),</div><div class="line">       thickness,</div><div class="line">       lineType );</div><div class="line">}</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyEllipse( Mat img, <span class="keywordtype">double</span> angle ) {</div><div class="line">        <span class="keywordtype">int</span> thickness = 2;</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        Imgproc.ellipse( img,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W/2, W/2 ),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>( W/4, W/16 ),</div><div class="line">                angle,</div><div class="line">                0.0,</div><div class="line">                360.0,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 0, 0 ),</div><div class="line">                thickness,</div><div class="line">                lineType,</div><div class="line">                shift );</div><div class="line">    }</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"><span class="keyword">def </span>my_ellipse(img, angle):</div><div class="line">    thickness = 2</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga57be400d8eff22fb946ae90c8e7441f9">cv.ellipse</a>(img,</div><div class="line">                (W // 2, W // 2),</div><div class="line">                (W // 4, W // 16),</div><div class="line">                angle,</div><div class="line">                0,</div><div class="line">                360,</div><div class="line">                (255, 0, 0),</div><div class="line">                thickness,</div><div class="line">                line_type)</div></div><!-- fragment --> </div> <ul>
<li>从上面的代码中，我们可以看到<b><a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga28b2267d35786f5f890ca167236cbc69" title="Draws a simple or thick elliptic arc or fills an ellipse sector. ">ellipse()</a></b>绘制椭圆，以便:<ul>
<li>椭圆将显示在图像中<b>img</b></li>
<li>椭圆中心位于<b>（w/2，w/2）</b>装在一个大小的盒子里<b>（w/4、w/16）</b></li>
<li>椭圆旋转<b>角</b>度</li>
<li>椭圆在两者之间延伸一条弧<b>0</b>和<b>360</b>度</li>
<li>图形的颜色将是<b>( 255, 0, 0 )</b>这意味着BGR值为蓝色。</li>
<li>椭圆是<b>厚度</b> is 2.</li>
</ul>
</li>
</ul>
<h4>MyFilledCircle</h4>
 <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line"><span class="keywordtype">void</span> MyFilledCircle( Mat img, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> center )</div><div class="line">{</div><div class="line">  <a class="code" href="../../d9/db7/group__datasets__gr.html#gga610754124ced68d1f05760b5948fbb76a6f0d8b2d9e3e947b2a5c1eff9e81ee95">circle</a>( img,</div><div class="line">      center,</div><div class="line">      w/32,</div><div class="line">      <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 255 ),</div><div class="line">      <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a89c5f6beef080e6df347167f85e07b9e">FILLED</a>,</div><div class="line">      <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a> );</div><div class="line">}</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyFilledCircle( Mat img, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> center ) {</div><div class="line">        <span class="keywordtype">int</span> thickness = -1;</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        Imgproc.circle( img,</div><div class="line">                center,</div><div class="line">                W/32,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 0, 255 ),</div><div class="line">                thickness,</div><div class="line">                lineType,</div><div class="line">                shift );</div><div class="line">    }</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"><span class="keyword">def </span>my_filled_circle(img, center):</div><div class="line">    thickness = -1</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#gaf10604b069374903dbd0f0488cb43670">cv.circle</a>(img,</div><div class="line">               center,</div><div class="line">               W // 32,</div><div class="line">               (0, 0, 255),</div><div class="line">               thickness,</div><div class="line">               line_type)</div></div><!-- fragment --> </div> <ul>
<li>类似于椭圆函数，我们可以观察到<em>圆圈</em>作为参数接收:<ul>
<li>显示圆的图像(<b>img</b>)</li>
<li>圆心表示为点的圆的中心<b>居中</b></li>
<li>圆的半径:<b>w/32</b></li>
<li>圆圈的颜色:<b>( 0, 0, 255 )</b>这意味着<em>红色</em>在BGR中</li>
<li>自<b>厚度</b>=-1，将绘制圆并填充。</li>
</ul>
</li>
</ul>
<h4>我的多边形</h4>
 <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line"><span class="keywordtype">void</span> MyPolygon( Mat img )</div><div class="line">{</div><div class="line">  <span class="keywordtype">int</span> lineType = <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a>;</div><div class="line"></div><div class="line">  <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a> rook_points[1][20];</div><div class="line">  rook_points[0][0]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,   7*w/8 );</div><div class="line">  rook_points[0][1]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,   7*w/8 );</div><div class="line">  rook_points[0][2]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,  13*w/16 );</div><div class="line">  rook_points[0][3]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 11*w/16, 13*w/16 );</div><div class="line">  rook_points[0][4]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 19*w/32,  3*w/8 );</div><div class="line">  rook_points[0][5]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,   3*w/8 );</div><div class="line">  rook_points[0][6]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  3*w/4,     w/8 );</div><div class="line">  rook_points[0][7]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*w/40,    w/8 );</div><div class="line">  rook_points[0][8]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*w/40,    w/4 );</div><div class="line">  rook_points[0][9]  = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*w/40,    w/4 );</div><div class="line">  rook_points[0][10] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*w/40,    w/8 );</div><div class="line">  rook_points[0][11] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*w/40,    w/8 );</div><div class="line">  rook_points[0][12] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*w/40,    w/4 );</div><div class="line">  rook_points[0][13] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*w/40,    w/4 );</div><div class="line">  rook_points[0][14] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*w/40,    w/8 );</div><div class="line">  rook_points[0][15] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,     w/8 );</div><div class="line">  rook_points[0][16] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,   3*w/8 );</div><div class="line">  rook_points[0][17] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 13*w/32,  3*w/8 );</div><div class="line">  rook_points[0][18] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  5*w/16, 13*w/16 );</div><div class="line">  rook_points[0][19] = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(    w/4,  13*w/16 );</div><div class="line"></div><div class="line">  <span class="keyword">const</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>* ppt[1] = { rook_points[0] };</div><div class="line">  <span class="keywordtype">int</span> npt[] = { 20 };</div><div class="line"></div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga8c69b68fab5f25e2223b6496aa60dad5">fillPoly</a>( img,</div><div class="line">        ppt,</div><div class="line">        npt,</div><div class="line">        1,</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 255, 255 ),</div><div class="line">        lineType );</div><div class="line">}</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">    <span class="keyword">private</span> <span class="keywordtype">void</span> MyPolygon( Mat img ) {</div><div class="line">        <span class="keywordtype">int</span> lineType = 8;</div><div class="line">        <span class="keywordtype">int</span> shift = 0;</div><div class="line"></div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>[] rook_points = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>[20];</div><div class="line">        rook_points[0]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, 7*W/8   );</div><div class="line">        rook_points[1]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, 7*W/8   );</div><div class="line">        rook_points[2]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, 13*W/16 );</div><div class="line">        rook_points[3]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 11*W/16, 13*W/16 );</div><div class="line">        rook_points[4]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 19*W/32, 3*W/8   );</div><div class="line">        rook_points[5]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, 3*W/8   );</div><div class="line">        rook_points[6]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(   3*W/4, W/8     );</div><div class="line">        rook_points[7]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*W/40, W/8     );</div><div class="line">        rook_points[8]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 26*W/40, W/4     );</div><div class="line">        rook_points[9]  = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*W/40, W/4     );</div><div class="line">        rook_points[10] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 22*W/40, W/8     );</div><div class="line">        rook_points[11] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*W/40, W/8     );</div><div class="line">        rook_points[12] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 18*W/40, W/4     );</div><div class="line">        rook_points[13] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*W/40, W/4     );</div><div class="line">        rook_points[14] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 14*W/40, W/8     );</div><div class="line">        rook_points[15] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, W/8     );</div><div class="line">        rook_points[16] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, 3*W/8   );</div><div class="line">        rook_points[17] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 13*W/32, 3*W/8   );</div><div class="line">        rook_points[18] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(  5*W/16, 13*W/16 );</div><div class="line">        rook_points[19] = <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(     W/4, 13*W/16 );</div><div class="line"></div><div class="line">        MatOfPoint matPt = <span class="keyword">new</span> MatOfPoint();</div><div class="line">        matPt.fromArray(rook_points);</div><div class="line"></div><div class="line">        List&lt;MatOfPoint&gt; ppt = <span class="keyword">new</span> ArrayList&lt;MatOfPoint&gt;();</div><div class="line">        ppt.add(matPt);</div><div class="line"></div><div class="line">        Imgproc.fillPoly(img,</div><div class="line">                ppt,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 255, 255, 255 ),</div><div class="line">                lineType,</div><div class="line">                shift,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(0,0) );</div><div class="line">    }</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"><span class="keyword">def </span>my_polygon(img):</div><div class="line">    line_type = 8</div><div class="line"></div><div class="line">    <span class="comment"># Create some points</span></div><div class="line">    ppt = np.array([[W / 4, 7 * W / 8], [3 * W / 4, 7 * W / 8],</div><div class="line">                    [3 * W / 4, 13 * W / 16], [11 * W / 16, 13 * W / 16],</div><div class="line">                    [19 * W / 32, 3 * W / 8], [3 * W / 4, 3 * W / 8],</div><div class="line">                    [3 * W / 4, W / 8], [26 * W / 40, W / 8],</div><div class="line">                    [26 * W / 40, W / 4], [22 * W / 40, W / 4],</div><div class="line">                    [22 * W / 40, W / 8], [18 * W / 40, W / 8],</div><div class="line">                    [18 * W / 40, W / 4], [14 * W / 40, W / 4],</div><div class="line">                    [14 * W / 40, W / 8], [W / 4, W / 8],</div><div class="line">                    [W / 4, 3 * W / 8], [13 * W / 32, 3 * W / 8],</div><div class="line">                    [5 * W / 16, 13 * W / 16], [W / 4, 13 * W / 16]], np.int32)</div><div class="line">    ppt = ppt.reshape((-1, 1, 2))</div><div class="line">    <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga311160e71d37e3b795324d097cb3a7dc">cv.fillPoly</a>(img, [ppt], (255, 255, 255), line_type)</div><div class="line">    <span class="comment"># Only drawind the lines would be:</span></div><div class="line">    <span class="comment"># cv.polylines(img, [ppt], True, (255, 0, 255), line_type)</span></div></div><!-- fragment --> </div> <ul>
<li>要绘制填充多边形，我们使用函数<b><a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga8c69b68fab5f25e2223b6496aa60dad5">fillPoly()</a></b>. 我们注意到:<ul>
<li>将绘制多边形<b>img</b></li>
<li>多边形的顶点是多边形中的一组点<b>幻灯片演示文件</b></li>
<li>多边形的颜色由<b>( 255, 255, 255 )</b>，这是的BGR值<em>白色</em></li>
</ul>
</li>
</ul>
<h4>矩形</h4>
 <div class="newInnerHTML" title="cpp" style="display: none;">C++</div><div class="toggleable_div label_cpp" style="display: none;"> <div class="fragment"><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>( rook_image,</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 7*w/8 ),</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( w, w),</div><div class="line">         <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 255, 255 ),</div><div class="line">         <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a89c5f6beef080e6df347167f85e07b9e">FILLED</a>,</div><div class="line">         <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a5d32eda7017db273a37f158e5b51442a">LINE_8</a> );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="java" style="display: none;">Java</div><div class="toggleable_div label_java" style="display: none;"> <div class="fragment"><div class="line">        Imgproc.rectangle( rook_image,</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( 0, 7*W/8 ),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( W, W),</div><div class="line">                <span class="keyword">new</span> <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>( 0, 255, 255 ),</div><div class="line">                -1,</div><div class="line">                8,</div><div class="line">                0 );</div></div><!-- fragment --> </div>  <div class="newInnerHTML" title="python" style="display: none;">Python</div><div class="toggleable_div label_python" style="display: none;"> <div class="fragment"><div class="line"><span class="comment"># 2.b. Creating rectangles</span></div><div class="line"><a class="code" href="../../d6/d6e/group__imgproc__draw.html#gac865734d137287c0afb7682ff7b3db23">cv.rectangle</a>(rook_image,</div><div class="line">              (0, 7 * W // 8),</div><div class="line">              (W, W),</div><div class="line">              (0, 255, 255),</div><div class="line">              -1,</div><div class="line">              8)</div></div><!-- fragment --> </div> <ul>
<li>最后我们有了<a class="el" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">cv::rectangle</a>函数（我们没有为这个家伙创建特殊函数）。我们注意到:<ul>
<li>矩形将在其上绘制<b>rook_image</b></li>
<li>矩形的两个相对顶点由<b>( 0, 7*w/8 )</b>和<b>( w, w )</b></li>
<li>矩形的颜色由<b>( 0, 255, 255 )</b>哪个是的BGR值<em>黄色的</em></li>
<li>因为厚度值由<b>FILLED (-1)</b>，矩形将被填充。</li>
</ul>
</li>
</ul>
<h2>结果</h2>
<p>编译和运行程序会得到如下结果:</p>
<div class="image">
<img src="../../Drawing_1_Tutorial_Result_0.png" alt="Drawing_1_Tutorial_Result_0.png">
</div>
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